Table 2 The distribution of answers about the menstrual cycle among respondents

What is the average length of a menstrual cycle?

20+/− 5 days

24+/−  6 days

28 +/−  7 days

35+/− 10 days

1.5% (296)

7.1% (1387)

90.1% (17483)

1.3% (249)

Which is the first day of the menstrual cycle?

The last day of menstrual bleeding.

The day when ovulation occurs.

The first day of menstrual bleeding.

It depends on the patient’s choice.

4.0% (782)

1.1% (214)

94.4% (18328)

0.5% (91)

On which day does ovulation occur?

Immediately after the end of menstruation.

Usually 14 days before the next period.

About the 20th day of the cycle (if it is regular, 25–30 days)

7 days before the expected menstruation.

2.4% (473)

85.7% (16635)

8.5% (1650)

3.4% (657)

How long does the average period of menstrual bleeding last and what is the average loss of blood?

3–5 days and 30–70 ml

5–7 days and less than 30 ml

7–10 days and less than 30 ml

It doesn’t matter how long the menstruation lasts

47.5% (9210)

31.0% (6021)

21.0% (4105)

0.41% (79)

In which phase is conception most likely to occur during unprotected intercourse?

During the first (follicular) phase of the cycle

In the ovulation phase

During the second (luteal) phase of the menstrual cycle

During menstrual phase.

3.2% (619)

83.9% (16287)

12.4% (2403)

0.5% (106)

Which part of the genital tract is the most common site of fertilization?

Vagina

Uterus

Fallopian tube

Ovary

2.7% (537)

24.5% (4756)

62.5% (12126)

10.3% (1996)

When does the basal body temperature increase during the menstrual cycle?

During menstruation.

At the time of ovulation.

In the second phase of the menstrual cycle (after ovulation).

The cycle phase has no influence on basal body temperature.

5.3% (1023)

82.6% (16043)

10.4% (2023)

1.7% (326)